Pneumatic cleaning device



M. DE J. ORTEGA ET AL FNEUMATIC CLEANING DEVICE June 2, 1959 4 Sheets-Sheet 2 Filed June 7, 1955 INVENTORS'. /17/4/9/0 fJ @9756A 565,455@

June Z, 1959 Filed June 7. 1955 June 2, 1959 M. DE .1. ORTEGA ET AL 2,889,006

PNEUMATIC CLEANING DEVICE Filed June 7. 1955 4 Sheets--Sheet 4 y if 253 i 50 O d y0 uur United States Patent (i)r PNEUMATIC CLEANING DEVICE Mario De J. Ortega, deceased, late of Asharoken Beach, N .Y., by Pauline A. Ortega, administratrix, and Pauline A. Ortega, Forest Hills West, N.Y.

Application June 7, 1955, Serial No. 513,774

2 Claims. (Cl. 18S-37) This invention relates to improvements in penumatic cleaning devices and the like and, more particularly, to cleaning devices of the tank or canister type which rely upon a partial vacuum or air pressure for their operation.

Although the suction or vacuum effect produced by such devices has been found to be extremely useful for cleaning purposes, air pressure has also been found to i be very elicient for related purposes, such as for removing cleaning fluids and moisture by evaporation,

spray guns for paints and insecticides, etc. Accordingly,

some vacuum cleaning devices have been equipped with p some means for selectively utilizing either a vacuum or pressurized fluid stream. With presently available equipment, however, a change from vacuum to pressure, or vice versa, usually requires either a `change in hose connections or some other equally cumbersome procedure.

It is, therefore, an object of this invention to eliminate the aforementioned inconveniences and provide a `device which may be used to selectively provide a vacuum or pressurized fluid stream by merely altering the path of flow of the fluid, internally of the device, in response to the shift of an external control member from one operat- `ing position to another. t

Another object of the invention is to provide a novel and improved pneumatic device which is substantially wholly self contained and which includes means for providing suction and pressure, a nozzle for aspirating air, l

housing means for contatining such separated water and solid particle content as it is separated from the fluid stream.

A further object of this invention is to provide a novel and improved device `of the character described, in which there is novel valve means for interchanging the conduit arrangement so that either suction or pressure may be applied at the intake nozzle which is applied to the oor or other surface being cleaned, the valve means including simple pivoted handle means which may be used to shift the device to the type of operating arrangement desired so that the utmost of versatility is achieved, without the need for shifting the nozzle itself or the connecting hose, or reversing the motor.

Still another object of the invention is to provide a novel and improved vacuum cleaning device of the charactcr described, in which there is a main housing defining a main chamber for the reception of the main interior casing, the latter providing a support for various elements of the structure, including electric motor means Patented June 2, 1959 ice that is connected to a source of electric power and which drives a pump or vaned impelling fan or the like.

Still a further object of the invention is to provide a novel and improved vacuum cleaning device which is Vsimple in design, small in size, compact and light in weight, self-contained and easily portable, and which includes an electric motor for driving the same and the fluid impelling means thereof, for cleaning dust, dirt and liquids.

Another object of the invention is to provide a novel and improved vacuum cleaning device of the character described, in which means are provided for supporting a long hose fitted with a nozzle or other aspirating and scrubbing head, in coiled disposition on the device `so that little of the available space is taken up by the hose, `and nothing is added to the oor area covered by the device.

Still another object of the invention is to provide a novel and improved vacuum cleaning water aspirating device of the character described, in which novel valve and `iloat means are provided, so that when the Water which has been separated from the aspirated uid reaches a predetermined level in the main fluid container of the device, a switch in the circuit to the driving motor is opened, thus shutting oil the suction and halting further ingress of iiuid of any kind into the device, thus maintaining the fluid level and protecting the equipment against excessive water intake, permitting the user to empty the liquid when such level is attained and automatically warning the user, by cessation of fluid aspinating operation, to empty the liquid container portion of the device.

A further object of the invention is to provide a novel device of the character described, in which the construction isso simple that the liquid receptacle may be quickly and easily detached from the main housing, to empty the accumulated liquid, without in any manner disturbing the main housing by merely opening one or more toggle clamps.

In furtherance of these object, We have provided a canister type vacuum cleaning device which is both efcient and convenient to use and which may be used, selectively, to provide either suction or pressure through an attached, flexible, hose. The canister contains a receptacle for the storage of liquid and solid waste matter, a motor and impeller assembly for producing a fluid stream, and selectively operated valves for altering the path of the iluid stream to produce either a. vacuum or pressure effect through the attached hose. This device is not only light, portable and convenient to use, but is also compact in size so that it may be readily stored when not in use. Suiciently strong suction may be produced through the attached hose so that scrub water and other cleaning fluids may be removed from floors The device is also so arranged and solid particles from the air stream Without damaging the mechanical and electrical operating parts of the device.

All of the foregoing, as well as other objects and advantages, will become apparent from a study of the following description, taken in conjunction with the accompanying drawings, wherein like characters of reference indicate corresponding parts throughout the several Views and wherein:

Figure l is a front elevational view showing a device constructed in accordance with this invention, the view being partly sectioned and partly broken away, to illustrate the interior construction thereof, the attached end of the flexible suction hose being shown in fragment only;

Figure 2 is a vfront elevational view of the device shown in Figure l, but showing the device unsectioned and illustrating it with a portion of the suction hose wound around the supporting means with the nozzle of the Vhose in engaged disposition with the floor being cleaned;

Figure 3 is a top plan View of the device shown in Figure 2, the hose Vbeing fully coiled on the hose supportportion thereof;

Figure 4 is a sectional top plan view of the device taken along line 4-4 of Figure 1, with parts being broken away;

Figure 5 is a sectional view taken along line 5--5 of Figure 1, showing the motor shroud and housing;

Figure 6 is a sectional view taken along line 6-6 of Figure 1, showing the motor and impeller housing support;

Figure 7 is a sectional view taken along line 7-7 of Figure 1, showing the disposition of the safety switch;

Figure 8 isa sectional viewv showing the details of the imotor and impeller assembly of the device and the Inanner of the support thereof;

Figure 9 is an enlarged sectional view taken along line 9 9 of Figure 1, showing the construction of certain o-f the operating control valves of the device;

Figure 10 is a sectional View taken along line 10-10 of Figure 9, showing the construction of one of the control valves;

Figure 11 is an enlarged sectional view taken along line 11-11 of Figure 1, showing the construction of the valve operating mechanism;

Figure 12 is a sectional View taken along line 12--12 of Figu-re 1, also showing portions of the valve operating mechanism;

Figure 13 is a perspective view, with parts broken away forsake of clarity, showing the details of certain parts of the valve operating mechanism shown in Figures 11 and 12;

' Figure 14 is a view taken along line 14-14 of Figzurevl, showing the position of the valve operating lever when the device is set for suction type operation; and

Figure 15 is a diagram o-f the electrical operating circuit of the device.

Referring now to the drawings, it is clear that there is shown a self contained vacuum cleaning device for removing dirt, dust particles, water and cleaning liquids and the like from doors and other surfaces during the cleaning process and thereafter, There is a main housing 20 formed by a lower main receptacle 22, and an upper main cover member or casing 24. The members 22 and 24 may be of hollow cylindrical shape, as shown, vand .of light metallic material interfitted to form a closed lchamber as further described below. Thus the lower vmain receptacle 22 has cylindrical side walls 26 extending upwardly integrally from the floor wall 28, and thus forming an upwardly open lower receptacle chamber 30.

From Figure 1, it is seen that the lower receptacle floor absorbing vibration which may be present in the machine, and also in avoiding scratching or marring the floor upon which it rests.

The cushion member 34 may be in the form of a disc,

or it may be conveniently annular with an axial vertical opening formed therein for lightness in weight and to trap any dirt particles or debris which might otherwise be entrained in its lower surface fibres. The lower recep- 'tacle 22 may-have its side wall 26 turned outwardly and rolled upon-itself, as shown in Figures 1 and 10, to form a rolled rim or ibead 40 at its upper edge, to provide a seat for the downwardly extending peripheral lower skirt 42 which is offset integrally, radially outwardly,

-from the lower edge portion 44 of the cover member 24, .being a portion of its cylindrical side outer wall 46.

As best seen in Figures l and 10, the cover member -of the main housing 20.

.4 24 has its side wall recessed annularly as at 48 to receive and engage with Vthe upper 'hooked end 50 of each of the toggle catches 52. Each of the toggle catches 52 includes operating levers 54 and hooks 56. The levers S4 are so constructed that when they are pressed inwardly towards the sides of the lower receptacle wall 26, as seen in Figures l and 2, the hooks 56 are brought to bear downwardly on the upper annular recess 48 of the peripherally enlarged portion 42 of the cover member 24. The downwardly and radially inward slope of the interconnecting material or web at 48 provides a suitable surface for engagement with hooks 56 in such a manner that they will not slip off until the operating levers 54 are moved radially outwardly on their proximal pivots carried by the wall 26 and moved upwardly to release the hook ends 50.

An annular gasket 58 of any suitable resilient gasket material may be so disposed that when the toggle catches 52 are closed, the gasket will be compressed between the low receptacle upper edge and the lower extended rim portion of the cover member 24, to provide an effective seal to prevent the surrounding air from entering the closed chamber 30 or any other interior parts therethrough, during the operation of the apparatus. To remove the Vcover member 24 for any desired purpose, it is only necessary to open the toggle catches 52 and disengage their hooks 50 from the peripheral annular shelf portion 48, by pulling the levers 54 outwardly and upwardly.

As best seen in Figure l, an inner liner casing 60 may -be provided to line the interior surface of the lower receptacle chamber 30 in the manner shown. As illustrated,

-the inner liner casing 60 may be formed of suitable material which is pervious to liquids, such as metallic screening or the like, and may have a floor wall 62 adapted to lie upon the recessed oor of the lower receptacle 22 extendingover the corner. portions 64 thereof, with integral cylindrical side walls 66 which lie closely adjacent to the side wall 26 of the lower receptacle. Thus, it will be recognized that when the cover member is removed, any liquids which have been sucked into the lower receptacle chamber 30 may be strained by merely lifting out Vthe inner liner screen 60 before the liquid is poured out of the receptacle.

As best seen in Figure 1, the cover member 24 has its outer side wall 46 turned inwardly at its upper rim edge 70 and then turned downwardly, cylindrically, to form an inner parapet wall 72 which meets with and integrally intersects the substantially plane roof wall 74 of the cover member 24. This construction thus provides a recessed hollow area 76 which is substantially invisible when viewed as in Figure 1, this area being hidden by the upstanding parapet wall 72 combined with the upper portion `of the outer wall 46. An opening is formed in the ycentral portion of the cover roof wall 74, through which `a cylindrical casing wall 82 extends.

The casing wall 82 is rigidly connected to the opening defining portions of the roof wall 74 and extends downwardly into the interior The inner extremities of the casing wall 82 terminates in a casing floor 84 which denes a centrallydisposed opening 86 that provides an air .passageway for reasons hereinafter discussed.

An annular rubber or other insulating base or support cushion member 88 is disposed upon the casing oor 84 so as to cover the marginal portion of its opening 86, and has the fluid circulating device supported thereon, as best fseen in Figures 1 and 8. An impeller housing 90 supports 'an entire assembly, including an electric motor 92 Vthat'has a driven shaft 93 drivingly connected to a rotary Yvane or propeller blade assembly 94 for rotation about a vertical axis. FromFigures 1, 6 and 8, it is seen that l thernotor.is provided with fins or vanes 96 that extend into the'airstream and serve to cool themotor by dissipatng' the` heat during the operation of' the'motorv and air impeller.

`gage with a conventional connecting cord. an on-OE switch (not shown) may be interposed in the From Figures 1 and 15, it is seen that the motor may `be connected to an external source of power, such as the power lines, by means of electric wires 98 leading to an external electric source of power through an accessible plug receptacle or fitting 100 (shown in Fig. 2) that has suitable prongs 102 which are adapted to releasably en- If desired,

electrical circuit to provide further control for the apparatus.

Included in the electrical circuit is an automatic cut-off safety switch 104, which is supported on a bracket 105 within the interior of the device. This switch is normally closed and has a contact element 106 which is adapted to be raised by the elevation of an underlying lioat member 108 to open the switch and circuit when excessive amounts of liquid enter the lower chamber 30. A predetermined, high level, of fluid in the chamber causes an elevation of the float member 108 which pushes the pin 110 of the contact element 106 upwardly to open the circuit. The contact element will then return to closed position only when the operator of the device has emptied the liquid from the lower pan or receptacle. It will be recognized that the open circuit caused by the high fluid level results in the deenergization of the fan motor 92 and halts further intake of uid or other material into the chamber 30. lf desired, a suitable warning buzzer or the like may be wired into the circuit to notify the operator that the chamber is full. Normally, however, the cessation of the motor noise is of sufficient notice to that effect.

As seen in Figure l, a foraminous or air permeable filter wall 114 is disposed to underly the lower portion of the cover member 24 and serves to divide the chamber 30 into two compartments. The lter 114 is conveniently carried by a spider assembly of ribs 118 which has openings formed therein wherever uid permeability is desired. The ilter 114 blocks the passage of particles of dust, dirt rand the like, thereby confining such matter to the interior of the chamber 30. The spider or frame 118 which underlies the filter may be secured to the underside of the cover member 24 in any suitable manner, as by brackets and bolts, or may be supported by the rolled bead 40 of the receptacle, as shown, so as to be removable therewith, :and has its outer perimeter extending into the space under fthe peripheral web recess 48 of the cover member so as to extend the liltering action all the way to the perimeter in the manner shown. Overlying the support spider or frame in this manner, the filter 114 forms a lioor for a centrally disposed chamber 120 which is disposed inside of the cover member 24, lying below the roof 74 and inside the walls 82 and 84, through which air may liow.

A cylindrical upper motor enclosure or shroud is shown at 130 and has an outer cylindrical casing 132 extending upwardly from its supported lower edge 134 which rests upon oor wall 84, as seen in Figure l, and spaced by web 136 from the concentric upper outer wall 138 of the hose receiving hub casing 140. There is thus formed an annular air passageway 142 between walls 138 and 132. The motor shroud has a curved inner wall 144 extending downwardly from a skirt wall 130, as best seen in Figure l, and bent outwardly at 146 to be `joined with the casing wall 132, thus forming an annular hollow area 148 which may be filled with spun glass or other fibrous material which is both sound deadening and vibration absorbent.

Referring to Figures l and 5, it is also apparent that there is substantial space between the motor 92 and the surrounding shroud enclosure 144 to permit free passage of air around the motor, and through the central opening or passageway 150 which is formed by the upper extremities of the shroud 130 and forms a sort of chimney passageway leading into the hollow dome chamber 152 under the dome roof 154 of the composite dome assembly 156. The annular shroud roof 158 of the shroud chamber 148 serves to enclose it at the top `and underlies the dome roof 154, being spaced therefrom as shown. A downwardly open, skirted, baie member 160 is supported from the inner undersurface of the dome roof 154, as shown in Figure l, to guide the air liow through the chamber 152. A carrying handle 162 may be secured by screws 164, or pivots, to the dome 154 in any suitable manner, added strength being obtained by securing it to reinforcing rods 166 which extend through the hollow dome chamber 152 and are secured to the lower wall 170, as by nuts 172. The structure is thus reinforced as to lend durability thereto, by avoiding any unnecessary stressingof the hollow metallic dome 154 at its upper portion.

The dome underwall or floor 170 is secured at its outer edges to the outer perimeter 174 of the dome 154 to enclose the chamber 152 from below, and may be joined to or integrated with the upper edge of the hose wind hub wall 138 in the manner shown in Figure l. From this view it is also seen that the passageway 142 opens through a plurality of openings 176 into the chamber 152 of the dome.

A flexible hollow hose 180 having any suitable cleaning or brushing nozzle 182 secured to its outer end for cleaning a licor, wall or the like, 184, may be of considerable length and is adapted to be coiled about the hose winding hub 140 in the manner shown in Figure 2, when the hose is not in use. A retaining handle 186 is substantially L-shaped, as seen in Figures l and 4, with its upper shaft 188 journaled in a bearing 190 carried by dome 156, so that the handle leg 192 is turnable about the axis of the shaft 188. A spring 194 is coiled about the shaft 188 to maintain radially inward bias on the shaft 188, thus serving to retain the handle 192 in any par ticular disposition as desired with the aid of detents or recesses 196. Thus the handle 192 may be turned downwards to retain the coiled hose, as shown in Figure 2, or upwardly out of the way to permit the hose to be uncoiled.

A well 200 is disposed, as viewed in Figures l and 6, at the right hand side of the device and has a substantially cylindrical outer wall 202 with side walls 204 joining with and bearing against the casing 138 to overlie an opening or valve seat 199. The valve seat 199 provides communication between the hose coupling 214 and the feeder conduit 236 when the associated flap valve 210 is in vertical position and which provides communication between the hose coupling 214 and the lower end portion of the annular passageway 142 when the ap valve 210 is in horizontal position, as shown in broken lines in Figure l. An air inlet valve 219 is positioned adjacent to the well 200 of the cover member 24, in the roof wall 74, and has a filter screen 220 associated therewith. This valve is opened in response to the downward retraction of the valve plunger 226 that opens the ports 228 which communicate directly with the air chamber 230 that surrounds and communicates with the lower por tion of the fan impeller shroud 90. When opened, direct communication between atmosphere and the interior of the chamber 230 is provided through the valve 219. When the device is set for vacuum operation, the air is exhausted through the air access or outlet openings 240 in the underside of the oor 170 of the dome 154 which are placed in registry with corresponding openings 242 in an annular, multi-opening, slide valve 244 which overlies` the outlet openings 240. As will be hereinafter described, these openings may be selectively closed to permit pressure operation of the device.

Operation All of the valves which control the operation of the device and which determine whether suction or pressure is applied to the terminal coupling 214, are operated by the single action of the control handle 250. rl`his handle is adapted to be moved, selectively, to and from one of two positions as shown in Figure 14. For purposes of illustration, the handle has been shown in the suction tion.

position in all of the figures of the drawings. In this position, it will be observed, the slide valve 244 is open, ap valve 210 is in Ithe vertical position and the inlet valve 219 is closed, so that air and entrained solid and/ or liquid matter enters the coupling 214 and passes into the lower chamber 30 of the canister through the feeder conduit 236. The filter 114 traps the solid particles and/or the liquid particles in the lower chamber 30 while permitting the air to pass through into the upper chamber 120, from which the air is drawn through the opening or inlet 86 in the casing floor 84 into the impeller housing 90 of the fluid circulating assembly. The impeller then forces the air upwardly, past the cooling fins 96 of the motor, through the passageway or outlet 150 in the shroud 130 into the dome chamber 152, from which the air is exhausted to atmosphere through the outlet ports 242, 240 in the roof floor and slide valve, respectively.

In the event it is desired to produce air pressure at the terminal end of the coupling 214, the operating handle 250 is rotated counter-clockwise to the pressure posi- Rotation of the handle causes similar rotation of the shaft 251 to which the handle is keyed, as is a pinion 248 and a spur gear 252. The pinion 248 meshes with a rack 246 which is carried by the slide valve 244, while the spur gear 252 meshes with a reduction gear 253 which is keyed to an idler shaft 256. Also keyed to the idler shaft 256, is a pinion 255 which meshes with a rack gear 257 that is integrally connected to the vertical push rod 254. It will, therefore, be recognized that the counter-clockwise rotation of the handle 250 causes limited sliding movement of the slide valve 244 under the action of the pinion 248, whereby the valve openings 242, 240 are brought out of registry with each other, thus closing the slide valve and blocking the flow of air therethrough.

Simultaneously, the vertical push rod 254 is forced downwardly under the action of the pinion 255. The lower extremity of the push rod 254 is angularly disposed and terminates in a rigidly secured saddle member 258 that has a slot 259 in each side thereof to permit the slide action of a pin 260 which is attached to one extremity of a crank arm 261. The other end of the crank arm 261 is keyed to an operating shaft 262, as is the ap valve 210, so that upon downward movement of the push rod 254, the ap valve is caused to move from a vertical to a horizontal position. Also keyed to the operating shaft 262 is another crank arm 263 which has a roller 264 journaled in its outer extremity. This roller engages a liange 265 that is rigidly secured to the stem 266 of the valve plunger 219. The tubular extension 267 of the valve housing 222 which houses the stem 266 is provided with a slot 26S to permit limited vertical movement of the flange 265 therein. A plug 269 threaded into the -1oottom of the tubular extension 267 provides a spring seat for the compression spring 276 which reacts against the bottom of the stem 266 to urge it upwardly. It will, therefore, be observed that as the flap valve 210 is moved from vertical to horizontal position, in response to the rotation of the operating shaft 262, the roller crank arm 263 causes downward movement of the valve stem 266 against the action of the spring 270 to open the air inlet valve 219.

Thus, the rotation of the operating handle 250 from suction to pressure position simultaneously closes the slide valve 244, shifts the flap valve 210 from a vertical position to a horizontal position, and opens the air inlet valve 219. Under the action of the fan motor 92, air is drawn into the chamber 230 through the inlet valve 219, from which it is circulated up through the opening 86 in the casing floor 84, into action with the irnpeller blade assembly 94, past the motor cooling fins 96 and into the dome chamber 152. The slide valve 244 being closed, the air thus passes into the openings 176 in the lower wall 170 of the roof, downwardly, through the air passageway 142. The ap valve 210 having been moved to a horizontal position, thear passes fromthe passageway V142 through the valve opening 199, into the coupling 214, whereupon it is exhausted under pressure, through the hose 180, into the atmosphere or into an attachment of the cleaning apparatus.

In the event it is desired to change the apparatus back to vacuum operation, it is only necessary to rotate the operating handle in a clockwise direction whereby, simultaneously, the pinions 248, 255 open the slide valve 244 and raise the push rod 254, respectively. The upward movement of the push rod 254 also causes the simultaneous movement of the flap valve 210 from its horizontal position to the vertical position and the closing of the air inlet valve 219 under the action of the Vspring 270 on the valve plunger 226. All of the parts having assumed the aforementioned positions, the air will be caused to flow to produce a vacuum effect at the hose coupling 214, in the manner hereinbefore described.

It will be recognized that all air which is discharged to the atmosphere, whether during suction or pressure operation, is thoroughly filtered so that contamination of the area is prevented. When the device is set for suction operation, solid and liquid particles are confined within the chamber 30 by the action of the filter 114, while the air is permitted to pass therethrough to be exhausted to atmosphere, ultimately, through the slide valve 244. When the device is set for pressure operation, the air which is drawn into the device through the inlet valve 219 is first filtered by the associated filter screen 220 and then passed into the upper chamber 230 to enter the inlet of the fluid circulating assembly. This filtered air is thus isolated from the lower debris collecting chamber 30 of the device by the filter 114.

It will also be noted that the filter 114 may be conveniently replaced, at any time, with a new filter element to provide maximum operating efficiency of the device.

It will be recognized that many other and different arrangements may be used within the purview of this invention. It is to be understood, therefore, that the form of the invention herewith shown and described is to be taken as the preferred example of the same andthat changes in the shape, size and arrangement of the parts may be resorted to without departing from the spirit of the invention. For example, the particular construction of the device may be altered to suit any particular design requirements, as desired. It is, therefore, desired that the forms disclosed be taken as illustrative and not as limiting. Furthermore, we do not wish to be limited beyond the limitations which may be imposed by the following claims.

What is claimed is:

1. A vacuum cleaning device comprising, in combination, a housing; a rlilter wall dividing said housing into upper and lower compartments; fluid impelling means within said housing; a valve assembly controlling the flow of liuid through said housing by said iiuid impelling means, said valve assembly including a passageway in communication at opposite ends with said upper and lower compartments, a soiled fluid inlet communicating with said passageway and said lower compartment, a filtered air outlet communicating with said upper compartment and said passageway, a clean air intake communicating with the exterior of said housing and said upper compartment, a pressurized air outlet adjacent to said clean air intake communicating with said upper and lower compartments, a first valve closure carried by said housing intermediate said pressurized air outlet and said soiled fluid inlet for movement between an initial open and an adjusted closed position relative to said soiled fluid inlet and an initial closed and an adjusted open position relative to said pressurized air outlet, a second valve closure carried by said housing for movement between an initial open and an adjusted closed position relative to said air outlet, a third valve closure carried by said housing for movement betweenan initial closed and an adjusted open position relative to said clean air intake, link means connecting said iirst, second, and third valve closures together for simultaneous movement between said initial and adjusted positions; said fluid impelling means in response to energization and with said valve closures in said initial positions being operative to draw air inwardly from said passageway through said soiled Huid inlet and through said lter to exhaust ltered air outwardly through said ltered air outlet, and said uid impelling means in response to energization and with said valve closures in said adjusted positions being operative to pressurize clean air drawn inwardly through said clean air intake and to exhaust said pressurized air outwardly through said passageway from said pressurized air outlet.

2. A vacuum cleaning device as set forth in claim 1, wherein said duid impelling means comprises a uni-directional air blower having an input side and an output side, a duct within said upper compartment in communication with said output side of said blower and said pressurized air outlet, said duct conducting air pressurized by said blower out of contact with said filter.

References Cited in the tile of this patent UNITED STATES PATENTS 

